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<div class="headertitle"><div class="title">channel_numeric_operations.hpp</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">//</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Copyright 2005-2007 Adobe Systems Incorporated</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">// Copyright 2021 Pranam Lashkari &lt;plashkari628@gmail.com&gt;</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">//</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">// Distributed under the Boost Software License, Version 1.0</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// See accompanying file LICENSE_1_0.txt or copy at</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">// http://www.boost.org/LICENSE_1_0.txt</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">//</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#ifndef BOOST_GIL_CHANNEL_NUMERIC_OPERATIONS_HPP</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="preprocessor">#define BOOST_GIL_CHANNEL_NUMERIC_OPERATIONS_HPP</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="preprocessor">#include &lt;boost/gil/channel.hpp&gt;</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceboost.html">boost</a> { <span class="keyword">namespace </span>gil {</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">// Function objects and utilities for channel-wise numeric operations.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">//</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">// List of currently defined functors:</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">// channel_plus_t (+)</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">// channel_minus_t (-)</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment">// channel_multiplies_t (*)</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment">// channel_divides_t (/),</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">// channel_plus_scalar_t (+s)</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">// channel_minus_scalar_t (-s),</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment">// channel_multiplies_scalar_t (*s)</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment">// channel_divides_scalar_t (/s),</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="comment">// channel_halves_t (/=2)</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment">// channel_zeros_t (=0)</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment">// channel_assigns_t (=)</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00035" data-start="{" data-end="};">
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__t.html"> 35</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__plus__t.html">channel_plus_t</a></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span>{</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keyword">using </span>ChannelRef1 = <span class="keyword">typename</span> channel_traits&lt;Channel1&gt;::const_reference;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keyword">using </span>ChannelRef2 = <span class="keyword">typename</span> channel_traits&lt;Channel2&gt;::const_reference;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef1, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="stringliteral">&quot;ChannelRef1 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef2, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="stringliteral">&quot;ChannelRef2 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="foldopen" id="foldopen00046" data-start="{" data-end="}">
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 46</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> {</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">return</span> ChannelResult(ch1) + ChannelResult(ch2);</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> }</div>
</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span>};</div>
</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> </div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00056" data-start="{" data-end="};">
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__t.html"> 56</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__minus__t.html">channel_minus_t</a></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span>{</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <span class="keyword">using </span>ChannelRef1 = <span class="keyword">typename</span> channel_traits&lt;Channel1&gt;::const_reference;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="keyword">using </span>ChannelRef2 = <span class="keyword">typename</span> channel_traits&lt;Channel2&gt;::const_reference;</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef1, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="stringliteral">&quot;ChannelRef1 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef2, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="stringliteral">&quot;ChannelRef2 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> </div>
<div class="foldopen" id="foldopen00067" data-start="{" data-end="}">
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 67</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> {</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">return</span> ChannelResult(ch1) - ChannelResult(ch2);</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span>};</div>
</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00077" data-start="{" data-end="};">
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__t.html"> 77</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplies__t.html">channel_multiplies_t</a></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span>{</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">using </span>ChannelRef1 = <span class="keyword">typename</span> channel_traits&lt;Channel1&gt;::const_reference;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">using </span>ChannelRef2 = <span class="keyword">typename</span> channel_traits&lt;Channel2&gt;::const_reference;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef1, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="stringliteral">&quot;ChannelRef1 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef2, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <span class="stringliteral">&quot;ChannelRef2 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> </div>
<div class="foldopen" id="foldopen00088" data-start="{" data-end="}">
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 88</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> {</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">return</span> ChannelResult(ch1) * ChannelResult(ch2);</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> }</div>
</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span>};</div>
</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00098" data-start="{" data-end="};">
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__t.html"> 98</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__divides__t.html">channel_divides_t</a></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span>{</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> <span class="keyword">using </span>ChannelRef1 = <span class="keyword">typename</span> channel_traits&lt;Channel1&gt;::const_reference;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span> <span class="keyword">using </span>ChannelRef2 = <span class="keyword">typename</span> channel_traits&lt;Channel2&gt;::const_reference;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef1, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span> <span class="stringliteral">&quot;ChannelRef1 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef2, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span> <span class="stringliteral">&quot;ChannelRef2 not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span> </div>
<div class="foldopen" id="foldopen00109" data-start="{" data-end="}">
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592"> 109</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> {</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordflow">return</span> ChannelResult(ch1) / ChannelResult(ch2);</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> }</div>
</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span>};</div>
</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> </div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00119" data-start="{" data-end="};">
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__plus__scalar__t.html"> 119</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__plus__scalar__t.html">channel_plus_scalar_t</a></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span>{</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::const_reference;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="stringliteral">&quot;ChannelRef not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> <span class="keyword">static_assert</span>(std::is_scalar&lt;Scalar&gt;::value, <span class="stringliteral">&quot;Scalar not a scalar&quot;</span>);</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;Scalar, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> <span class="stringliteral">&quot;Scalar not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> <span class="keyword">auto</span> operator()(ChannelRef channel, Scalar <span class="keyword">const</span>&amp; scalar) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> {</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">return</span> ChannelResult(channel) + ChannelResult(scalar);</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span> }</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span>};</div>
</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> </div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00138" data-start="{" data-end="};">
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__scalar__t.html"> 138</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__minus__scalar__t.html">channel_minus_scalar_t</a></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span>{</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::const_reference;</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> <span class="stringliteral">&quot;ChannelRef not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> <span class="keyword">static_assert</span>(std::is_scalar&lt;Scalar&gt;::value, <span class="stringliteral">&quot;Scalar not a scalar&quot;</span>);</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;Scalar, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> <span class="stringliteral">&quot;Scalar not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> </div>
<div class="foldopen" id="foldopen00149" data-start="{" data-end="}">
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 149</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>&amp; scalar) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> {</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> <span class="comment">// TODO: Conversion after subtraction vs conversion of operands in channel_minus_t?</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keywordflow">return</span> ChannelResult(channel - scalar);</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> }</div>
</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span>};</div>
</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span> </div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00160" data-start="{" data-end="};">
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html"> 160</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html">channel_multiplies_scalar_t</a></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span>{</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::const_reference;</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> <span class="stringliteral">&quot;ChannelRef not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> <span class="keyword">static_assert</span>(std::is_scalar&lt;Scalar&gt;::value, <span class="stringliteral">&quot;Scalar not a scalar&quot;</span>);</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;Scalar, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="stringliteral">&quot;Scalar not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span> </div>
<div class="foldopen" id="foldopen00171" data-start="{" data-end="}">
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 171</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>&amp; scalar) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span> {</div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span> <span class="keywordflow">return</span> ChannelResult(channel) * ChannelResult(scalar);</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span> }</div>
</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span>};</div>
</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel, <span class="keyword">typename</span> Scalar, <span class="keyword">typename</span> ChannelResult&gt;</div>
<div class="foldopen" id="foldopen00181" data-start="{" data-end="};">
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__scalar__t.html"> 181</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__divides__scalar__t.html">channel_divides_scalar_t</a></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span>{</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::const_reference;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span> <span class="stringliteral">&quot;ChannelRef not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span> <span class="keyword">static_assert</span>(std::is_scalar&lt;Scalar&gt;::value, <span class="stringliteral">&quot;Scalar not a scalar&quot;</span>);</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;Scalar, ChannelResult&gt;::value,</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span> <span class="stringliteral">&quot;Scalar not convertible to ChannelResult&quot;</span>);</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span> </div>
<div class="foldopen" id="foldopen00192" data-start="{" data-end="}">
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4"> 192</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">operator()</a>(ChannelRef channel, Scalar <span class="keyword">const</span>&amp; scalar) <span class="keyword">const</span> -&gt; ChannelResult</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span> {</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span> <span class="keywordflow">return</span> ChannelResult(channel) / ChannelResult(scalar);</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span> }</div>
</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span>};</div>
</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span> </div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel&gt;</div>
<div class="foldopen" id="foldopen00202" data-start="{" data-end="};">
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__halves__t.html"> 202</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__halves__t.html">channel_halves_t</a></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span>{</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::reference;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span> </div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span> <span class="keyword">auto</span> operator()(ChannelRef channel) <span class="keyword">const</span> -&gt; ChannelRef</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span> {</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span> <span class="comment">// TODO: Split into steps: extract with explicit conversion to double, divide and assign?</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span> <span class="comment">//double const v = ch;</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span> <span class="comment">//ch = static_cast&lt;Channel&gt;(v / 2.0);</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span> channel /= 2.0;</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span> <span class="keywordflow">return</span> channel;</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span> }</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span>};</div>
</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span> </div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel&gt;</div>
<div class="foldopen" id="foldopen00220" data-start="{" data-end="};">
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__zeros__t.html"> 220</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__zeros__t.html">channel_zeros_t</a></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span>{</div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span> <span class="keyword">using </span>ChannelRef = <span class="keyword">typename</span> channel_traits&lt;Channel&gt;::reference;</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span> </div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span> <span class="keyword">auto</span> operator()(ChannelRef channel) <span class="keyword">const</span> -&gt; ChannelRef</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span> {</div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span> channel = Channel(0);</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span> <span class="keywordflow">return</span> channel;</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span> }</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span>};</div>
</div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span> </div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span><span class="keyword">template</span> &lt;<span class="keyword">typename</span> Channel1, <span class="keyword">typename</span> Channel2&gt;</div>
<div class="foldopen" id="foldopen00235" data-start="{" data-end="};">
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__assigns__t.html"> 235</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structboost_1_1gil_1_1channel__assigns__t.html">channel_assigns_t</a></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span>{</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span> <span class="keyword">using </span>ChannelRef1 = <span class="keyword">typename</span> channel_traits&lt;Channel1&gt;::const_reference;</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span> <span class="keyword">using </span>ChannelRef2 = <span class="keyword">typename</span> channel_traits&lt;Channel2&gt;::reference;</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span> <span class="keyword">static_assert</span>(std::is_convertible&lt;ChannelRef1, Channel2&gt;::value,</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span> <span class="stringliteral">&quot;ChannelRef1 not convertible to Channel2&quot;</span>);</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span> </div>
<div class="foldopen" id="foldopen00244" data-start="{" data-end="}">
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"><a class="line" href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687"> 244</a></span> <span class="keyword">auto</span> <a class="code hl_function" href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687">operator()</a>(ChannelRef1 ch1, ChannelRef2 ch2) <span class="keyword">const</span> -&gt; ChannelRef2</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span> {</div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span> ch2 = Channel2(ch1);</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span> <span class="keywordflow">return</span> ch2;</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span> }</div>
</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span>};</div>
</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span> </div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span>}} <span class="comment">// namespace boost::gil</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span> </div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span><span class="preprocessor">#endif</span></div>
<div class="ttc" id="anamespaceboost_html"><div class="ttname"><a href="namespaceboost.html">boost</a></div><div class="ttdoc">defined(BOOST_NO_CXX17_HDR_MEMORY_RESOURCE)</div><div class="ttdef"><b>Definition</b> algorithm.hpp:36</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__assigns__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__assigns__t.html">boost::gil::channel_assigns_t</a></div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:236</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__assigns__t_html_aadf200f27049a8dcd611b002e328f687"><div class="ttname"><a href="structboost_1_1gil_1_1channel__assigns__t.html#aadf200f27049a8dcd611b002e328f687">boost::gil::channel_assigns_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -&gt; ChannelRef2</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:244</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__scalar__t.html">boost::gil::channel_divides_scalar_t</a></div><div class="ttdoc">Arithmetic operation of dividing channel value by scalar.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:182</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_divides_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &amp;scalar) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:192</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__t.html">boost::gil::channel_divides_t</a></div><div class="ttdoc">Arithmetic operation of division of two channel values.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:99</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__divides__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__divides__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_divides_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:109</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__halves__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__halves__t.html">boost::gil::channel_halves_t</a></div><div class="ttdoc">Arithmetic operation of dividing channel value by 2.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:203</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__scalar__t.html">boost::gil::channel_minus_scalar_t</a></div><div class="ttdoc">Arithmetic operation of subtracting scalar from channel value.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:139</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_minus_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &amp;scalar) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:149</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__t.html">boost::gil::channel_minus_t</a></div><div class="ttdoc">Arithmetic operation of subtraction of two channel values.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:57</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__minus__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__minus__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_minus_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:67</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html">boost::gil::channel_multiplies_scalar_t</a></div><div class="ttdoc">Arithmetic operation of channel value by a scalar.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:161</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__scalar__t_html_a05d48ef4b2292805a8b7e538162395e4"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__scalar__t.html#a05d48ef4b2292805a8b7e538162395e4">boost::gil::channel_multiplies_scalar_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef channel, Scalar const &amp;scalar) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:171</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__t.html">boost::gil::channel_multiplies_t</a></div><div class="ttdoc">Arithmetic operation of multiplication of two channel values.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:78</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__multiplies__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__multiplies__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_multiplies_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:88</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__scalar__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__scalar__t.html">boost::gil::channel_plus_scalar_t</a></div><div class="ttdoc">Arithmetic operation of adding scalar to channel value.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:120</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__t.html">boost::gil::channel_plus_t</a></div><div class="ttdoc">Arithmetic operation of addition of two channel values.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:36</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__plus__t_html_a1fa35f151b172e35ca3d112ad7d82592"><div class="ttname"><a href="structboost_1_1gil_1_1channel__plus__t.html#a1fa35f151b172e35ca3d112ad7d82592">boost::gil::channel_plus_t::operator()</a></div><div class="ttdeci">auto operator()(ChannelRef1 ch1, ChannelRef2 ch2) const -&gt; ChannelResult</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:46</div></div>
<div class="ttc" id="astructboost_1_1gil_1_1channel__zeros__t_html"><div class="ttname"><a href="structboost_1_1gil_1_1channel__zeros__t.html">boost::gil::channel_zeros_t</a></div><div class="ttdoc">Operation of setting channel value to zero.</div><div class="ttdef"><b>Definition</b> channel_numeric_operations.hpp:221</div></div>
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